LXR linux/fs/ocfs2/aops.h

   1/* -*- mode: c; c-basic-offset: 8; -*-
   2 * vim: noexpandtab sw=8 ts=8 sts=0:
   3 *
   4 * Copyright (C) 2002, 2004, 2005 Oracle.  All rights reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public
   8 * License as published by the Free Software Foundation; either
   9 * version 2 of the License, or (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 * General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public
  17 * License along with this program; if not, write to the
  18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 * Boston, MA 021110-1307, USA.
  20 */
  21
  22#ifndef OCFS2_AOPS_H
  23#define OCFS2_AOPS_H
  24
  25#include <linux/fs.h>
  26
  27handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
  28                                                         struct page *page,
  29                                                         unsigned from,
  30                                                         unsigned to);
  31
  32int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
  33                          struct inode *inode, unsigned int from,
  34                          unsigned int to, int new);
  35
  36void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages);
  37
  38int walk_page_buffers(  handle_t *handle,
  39                        struct buffer_head *head,
  40                        unsigned from,
  41                        unsigned to,
  42                        int *partial,
  43                        int (*fn)(      handle_t *handle,
  44                                        struct buffer_head *bh));
  45
  46int ocfs2_write_end_nolock(struct address_space *mapping,
  47                           loff_t pos, unsigned len, unsigned copied, void *fsdata);
  48
  49typedef enum {
  50        OCFS2_WRITE_BUFFER = 0,
  51        OCFS2_WRITE_DIRECT,
  52        OCFS2_WRITE_MMAP,
  53} ocfs2_write_type_t;
  54
  55int ocfs2_write_begin_nolock(struct address_space *mapping,
  56                             loff_t pos, unsigned len, ocfs2_write_type_t type,
  57                             struct page **pagep, void **fsdata,
  58                             struct buffer_head *di_bh, struct page *mmap_page);
  59
  60int ocfs2_read_inline_data(struct inode *inode, struct page *page,
  61                           struct buffer_head *di_bh);
  62int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
  63
  64int ocfs2_get_block(struct inode *inode, sector_t iblock,
  65                    struct buffer_head *bh_result, int create);
  66/* all ocfs2_dio_end_io()'s fault */
  67#define ocfs2_iocb_is_rw_locked(iocb) \
  68        test_bit(0, (unsigned long *)&iocb->private)
  69static inline void ocfs2_iocb_set_rw_locked(struct kiocb *iocb, int level)
  70{
  71        set_bit(0, (unsigned long *)&iocb->private);
  72        if (level)
  73                set_bit(1, (unsigned long *)&iocb->private);
  74        else
  75                clear_bit(1, (unsigned long *)&iocb->private);
  76}
  77
  78/*
  79 * Using a named enum representing lock types in terms of #N bit stored in
  80 * iocb->private, which is going to be used for communication between
  81 * ocfs2_dio_end_io() and ocfs2_file_write/read_iter().
  82 */
  83enum ocfs2_iocb_lock_bits {
  84        OCFS2_IOCB_RW_LOCK = 0,
  85        OCFS2_IOCB_RW_LOCK_LEVEL,
  86        OCFS2_IOCB_NUM_LOCKS
  87};
  88
  89#define ocfs2_iocb_clear_rw_locked(iocb) \
  90        clear_bit(OCFS2_IOCB_RW_LOCK, (unsigned long *)&iocb->private)
  91#define ocfs2_iocb_rw_locked_level(iocb) \
  92        test_bit(OCFS2_IOCB_RW_LOCK_LEVEL, (unsigned long *)&iocb->private)
  93
  94#endif /* OCFS2_FILE_H */
  95